AUSTIN University of Texas head coach Mack Brown has relieved defensive coordinator Manny Diaz of his duties one day after the Longhorns lost to BYU.

Texas gave up 550 yards rushing in the 40-21 loss to the Cougars on Saturday night. The Longhorns gave up 679 total yards.

Diaz will be replaced by former defensive coordinator Greg Robinson, who was last with UT in 2004 and currently serves as an analyst for the Longhorn Network.

Our performance on defense last night was unacceptable, and we need to change that, Brown said. Greg will be here tonight and get with the staff and players to start preparing for Ole Miss. He will be running our defense immediately. We re very fortunate that Greg has been around, watched all of our practice video and has a good scouting report moving forward. His familiarity with the staff and players should make for a smooth transition. He knows this place, did a terrific job in leading our defense before, and I m excited to have him back on the field. We re back at it and working hard to beat Ole Miss this weekend.

Robinson also spent time at Michigan and was the head coach at Syracuse from 2005 to 2008.

This is a tough deal for everyone involved, but I love The University of Texas, and Coach Brown has been wonderful to me, Robinson said. I ll do anything I can to help him, so when he called, I told him I d be there today. I know the staff, have a lot of respect for them and am excited for the challenge moving forward. I ve been around the team a lot, watched all of their film and have been self scouting and scouting opponents since I came on board in July. Because of Longhorn Network, I ve also been able to see these guys for two to three years and am very familiar with the personnel.

Diaz has been reassigned to a position within the athletic department.

Diaz has been with the school since 2011 after coming over from Mississippi State. Last year, the Texas defense was very much maligned, giving up 403 yards per game, the most of any Texas team in history.

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